It looks normal, I’m not really seeing anything that may have prompted you to think otherwise.

Pretty sure it gives you a warning that your whole free trial will end, no?

Yeah if you insist on replacing the screen yourself. Or getting someone else to do it.

Yes, that will expand over time unfortunately.

With basic tasks, heat absolutely should not be an issue even on Intel MacBooks.

It’s an Air (thicker bezels)

A laptop like this shouldn’t be running slow. As someone else already suggested, check your Activity Monitor to see what’s going on there, if anything.